Unfortunately, post 9/11 I have to assume they will crash they plane, killing not only everyone on board, but many on the ground. I would attack anyone who attempted to hijack the plane, and use as much force as needed to stop them. No holds barred - eye gouging, groin shots, biting - anything it takes to stop the threat, and if they die it's on them, not me. If I'm going to die, I'll do it fighting.